US7559293B2 - High efficiency water heater - Google Patents

High efficiency water heater Download PDF

Info

Publication number
US7559293B2
US7559293B2 US10/374,605 US37460503A US7559293B2 US 7559293 B2 US7559293 B2 US 7559293B2 US 37460503 A US37460503 A US 37460503A US 7559293 B2 US7559293 B2 US 7559293B2
Authority
US
United States
Prior art keywords
water tank
water
pass
heat exchange
water heater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US10/374,605
Other languages
English (en)
Other versions
US20040011301A1 (en
Inventor
Michael Gordon
Timothy D. Scott
Jason Sutherland
Christopher Stafford
Ross Campbell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bradford White Corp
Original Assignee
Bradford White Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bradford White Corp filed Critical Bradford White Corp
Priority to US10/374,605 priority Critical patent/US7559293B2/en
Priority to CA2844271A priority patent/CA2844271C/fr
Priority to TW092115030A priority patent/TWI276761B/zh
Priority to CA2430807A priority patent/CA2430807C/fr
Priority to EP03253535A priority patent/EP1369647B1/fr
Assigned to BRADFORD WHITE CORPORATION reassignment BRADFORD WHITE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CAMPBELL, ROSS, GORDON, MICHAEL, SCOTT, TIMOTHY D., STAFFORD, CHRISTOPHER, SUTHERLAND, JASON
Publication of US20040011301A1 publication Critical patent/US20040011301A1/en
Priority to US12/121,154 priority patent/US7900589B2/en
Application granted granted Critical
Publication of US7559293B2 publication Critical patent/US7559293B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/205—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with furnace tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Definitions

  • the present invention relates to a high efficiency water heater and, more particularly, to a commercial water heater having improved heat exchange performance.
  • Such condensate is typically acidic, with pH values often in the range of between about 2 to 5.
  • the formation of increased amounts of such acidic condensate, even in relatively small quantities, can accelerate the corrosion of heat exchange tubing, increase oxidation and scale formation, reduce heat exchange efficiency and contribute to failure of the water heater.
  • this invention provides a water heater having improved heat exchange efficiency.
  • the water heater includes a water tank and a flue system positioned to extend at least partially through an interior of the water tank.
  • the water tank and the flue system are positioned to transfer heat from combustion products within the flue system to water in the water tank.
  • the flue system includes an upstream heat exchange portion having at least one substantially vertical flue tube, and a downstream heat exchange portion having at least one substantially vertical flue tube.
  • the upstream heat exchange portion of the flue system provides a first pass for heat exchange with water in the water tank.
  • the downstream heat exchange portion provides a second pass for heat exchange with water in the water tank.
  • a water heater having improved heat exchange efficiency includes a blower configured to receive fuel and air.
  • the blower is oriented to deliver the fuel and air along a substantially vertical axis.
  • the water heater also includes a burner positioned downstream from the blower along the axis to receive the fuel and air.
  • the burner is configured to deliver the products of combustion of the fuel and air along the axis.
  • the water heater also includes a flue tube having a segment extending along the axis. The flue tube is positioned to receive the products of combustion from the burner, and the flue tube provides a first pass for heat exchange with water in the water heater.
  • a system for exhausting combustion products and draining condensate from a flue system of a water heater includes a receptacle positioned to collect combustion products and condensate from the flue system.
  • the receptacle defines an orifice positioned to exhaust combustion products from within the receptacle.
  • the receptacle also defines an outlet positioned to drain condensate from the receptacle.
  • a flue system for a water heater includes an upstream heat exchange portion for providing a first pass for heat exchange with water in the water heater, and a downstream heat exchange portion for providing a second pass for heat exchange with water in the water heater.
  • the downstream heat exchange portion includes at least one substantially vertical flue tube having an inner surface exposed to combustion products flowing through the vertical flue tube, and an outer surface exposed to water in the water heater. Each of the inner and outer surfaces is coated to reduce corrosion of the vertical flue tube.
  • this invention provides an assembly for directing products of combustion between segments of a flue of a water heater.
  • the assembly includes an insulator at least partially defining a chamber configured to direct products of combustion between the flue segments.
  • the assembly also includes a cover configured to at least partially surround the insulator.
  • the cover is configured to be coupled to a water tank of the water heater. In an uncompressed state, the insulator is dimensioned to extend outwardly from the cover when the insulator is positioned in the cover. In a compressed state, the insulator is dimensioned to permit coupling of the cover to the water tank.
  • a method of providing an insulated passage for products of combustion between flue segments of a water heater includes positioning an insulator in a cover such that a portion of the insulator extends out of the cover. The method also includes compressing the extended portion of the insulator against a water tank of the water heater such that the cover is proximal to or touching the water tank. The method also includes coupling the cover to the water tank, thereby forming a sealed and insulated passage between the flue segments.
  • FIG. 1 is a top perspective view of an exemplary embodiment of a water heater according to aspects of this invention.
  • FIG. 2 is a cross-sectional perspective view of the water heater illustrated in FIG. 1 .
  • FIG. 3 is another cross-sectional perspective view of the water heater illustrated in FIG. 1 .
  • FIG. 4 is yet another cross-sectional perspective view of the water heater illustrated in FIG. 1 .
  • FIG. 5 is a cross-sectional perspective view of a lower portion of the water heater illustrated in FIG. 1 .
  • FIG. 6A is a bottom perspective view of an exemplary embodiment of a tank assembly according to aspects of this invention.
  • FIG. 6B is a top perspective view of the tank assembly illustrated in FIG. 6A .
  • FIG. 7 is a bottom exploded perspective view of a lower portion of the tank assembly illustrated in FIG. 6A .
  • FIG. 7 a is a partial cross sectional view of a collector assembly in accordance with an exemplary embodiment of the present invention.
  • FIG. 7 b is another partial cross sectional view of a collector assembly in accordance with an exemplary embodiment of the present invention.
  • FIG. 8 is another bottom exploded perspective view of the lower portion of the tank assembly illustrated in FIG. 6A .
  • FIG. 9 is an exploded perspective view of an exemplary embodiment of an exhaust collector assembly according to aspects of this invention.
  • FIG. 10 is a top exploded perspective view of the tank assembly illustrated in FIG. 6B .
  • FIG. 11A is a top view of an exemplary embodiment of a combustion surround base according to aspects of this invention.
  • FIG. 11B is a side view of the combustion surround base illustrated in FIG. 11A .
  • FIG. 12 is a top exploded perspective view of an exemplary embodiment of a blower and combustion assembly according to aspects of this invention.
  • FIG. 13 is a cross-section side view of a subassembly of the blower and combustion assembly illustrated in FIG. 12 .
  • FIG. 14 is a cross-sectional side view of an exemplary embodiment of a burner according to aspects of this invention.
  • FIG. 15 is a cross-sectional side view of an exemplary embodiment of a burner mounting flange assembly according to aspects of this invention.
  • FIG. 16 is a perspective view of an exemplary embodiment of a blower assembly according to aspects of this invention.
  • FIG. 17 is a perspective view of a top portion of the water heater illustrated in FIG. 1 .
  • FIG. 18 is a perspective view of an exemplary embodiment of a head assembly according to aspects of this invention.
  • FIG. 19 is a front view of an exemplary embodiment of a combustion surround component of the head assembly illustrated in FIG. 18 .
  • a flue system for a water heater such as a water heater 10 having improved heat exchange efficiency.
  • the flue system includes an upstream heat exchange portion having at least one substantially vertical flue tube such as tube 26 .
  • the flue system also includes a downstream heat exchange portion having at least one substantially vertical flue tube such as tube 30 .
  • the upstream heat exchange portion provides a first pass for heat exchange with water in a water heater 10 .
  • the downstream heat exchange portion provides a second pass for heat exchange with water in the water heater 10 .
  • the water heater 10 includes a blower such as blower 104 configured to receive fuel and air.
  • the blower 104 is oriented to deliver the fuel and air along a substantially vertical axis.
  • the water heater 10 also includes a burner such as burner 102 positioned downstream from the blower 104 along the axis to receive the fuel and air.
  • the burner 102 is configured to deliver the products of combustion of the fuel and air along the axis.
  • the water heater 10 also includes flue tube 26 having a segment extending along the axis. The flue tube 26 is positioned to receive the products of combustion from the burner 102 , and the flue tube provides a first pass for heat exchange with water in the water heater 10 .
  • a system 40 for exhausting combustion products and draining condensate from a flue system of a water heater 10 includes a receptacle such as receptacle 64 positioned to collect combustion products and condensate from the flue system.
  • the receptacle 64 defines an orifice such as orifice 68 positioned to exhaust combustion products from within the receptacle 64 .
  • the receptacle 64 also defines an outlet such as outlet 70 positioned to drain condensate from the receptacle 64 .
  • a flue system for a water heater 10 includes an upstream heat exchange portion 26 for providing a first pass for heat exchange with water in the water heater 10 , and a downstream heat exchange portion for providing a second pass for heat exchange with water in the water heater 10 .
  • the downstream heat exchange portion includes at least one substantially vertical flue tube 30 having an inner surface exposed to combustion products flowing through the vertical flue tube 30 , and an outer surface exposed to water in the water heater 10 . Each of the inner and outer surfaces are coated to reduce corrosion of the vertical flue tube 30 .
  • an assembly 28 for directing products of combustion between segments of a flue of a water heater 10 is provided.
  • the assembly 28 includes an insulator such as insulator 48 at least partially defining a chamber configured to direct products of combustion between the flue segments.
  • the assembly 28 also includes a cover such as cover 56 configured to at least partially surround the insulator 48 .
  • the cover 56 is configured to be coupled to a water tank 12 of the water heater 10 .
  • the insulator 48 In an uncompressed state, the insulator 48 is dimensioned to extend outwardly from the cover 56 when the insulator 48 is positioned in the cover 56 . In a compressed state, the insulator 48 is dimensioned to permit coupling of the cover 56 to the water tank 12 .
  • a method of providing an insulated passage for products of combustion between flue segments of a water heater 10 includes positioning an insulator 48 in a cover 56 such that a portion of the insulator 48 extends out of the cover 56 .
  • the method also includes compressing the extended portion of the insulator 48 against a water tank 12 of the water heater 10 such that the cover 56 is proximal to or touching the water tank 12 .
  • the method also includes coupling the cover 56 to the water tank 12 , thereby forming a sealed and insulated passage between the flue segments.
  • one aspect of this invention provides a flue system for a water heater 10 having improved heat exchange efficiency.
  • the flue system includes a primary heat exchange portion extending along an upstream segment of the flue system and having at least one substantially vertical flue tube 26 .
  • the flue system also includes a secondary heat exchange portion extending along a downstream segment of the flue system and having at least two substantially vertical flue tubes such as flue tubes 30 A, 30 B, and 36 A- 36 H.
  • the primary heat exchange portion provides a first pass for heat exchange with water in the water heater 10
  • the secondary heat exchange portion provides second and third passes for heat exchange with water in the water heater 10 .
  • a water heater 10 having improved heat exchange efficiency includes a blower 104 configured to receive a premix of fuel and air, wherein the blower 104 is oriented to deliver the premix along a substantially vertical axis.
  • the water heater 10 also includes a burner 102 positioned downstream from the blower 104 along the axis to receive the premix.
  • the burner 102 is configured to deliver the products of combustion of the premix along the axis.
  • the water heater 10 also includes a flue tube having a segment 26 extending along the axis. The flue tube is positioned to receive the products of combustion from the burner 102 , and the flue segment 26 provides a first pass for heat exchange with water in the water heater 10 .
  • a commercial water heater embodying exemplary aspects of this invention is generally designated by the numeral “ 10 .” Although repeated reference will be made to “commercial” water heaters, the descriptions herein also apply to residential or domestic water heaters as well as other heat transfer systems.
  • the commercial water heater 10 includes a tank assembly 12 provided with a cover portion such as a head assembly 200 .
  • Commercial water heater 10 has an air inlet 16 , which facilitates the introduction of air to the water heater's combustion system.
  • the commercial water heater 10 also has a gas inlet 18 , which facilitates the introduction of gas or other fuel.
  • Commercial water heater 10 also is provided with a pressure relief valve assembly 20 .
  • Unheated water is introduced into the water heater 10 by means of a cold or unheated water inlet 22 . Heated water exits the water heater 10 by means of a heated or hot water outlet 24 .
  • commercial water heater 10 is optionally provided with a side inlet for unheated water that may be at a lower elevation, depending upon the preference of the user of the water heater 10 and the manner or location in which the water heater 10 is installed.
  • FIGS. 2-5 an exemplary embodiment of a heat exchange system will be described.
  • Arrows in FIGS. 2-5 indicate the flow of combustion products through the heat exchange system.
  • the heat exchange system illustrated in the figures is a so-called “three pass” heat exchanger in which the combustion products make three passes through the water to be heated, thereby exchanging heat to the water in each of the three passes.
  • the heat exchange system includes a primary heat exchange portion and a secondary heat exchange portion downstream from the primary heat exchange portion.
  • the first pass of the heat exchanger provides for the primary heat exchange and the second and third passes provide for the secondary heat exchange.
  • the ratio of the surface area of the secondary heat exchange to that of the primary heat exchange can be altered to optimize the efficiency of the water heater.
  • the ratio can be adjusted by modifying the number and/or size of flues in each of the primary and secondary heat exchanges. In one exemplary embodiment, however, the ratio is maintained at or near 3:1, although other ratios may be acceptable as well.
  • the velocity at which the combustion products travel through the heat exchange system can also impact the efficiency of the water heater.
  • the velocity of the combustion products at various segments of the heat exchange system is also dependent upon the number and/or size of flues selected. The number and/or size of the flues also impact the ratio of BTUs to heat exchange surface area.
  • FIG. 2 a cross-sectional view of the commercial water heater 10 is provided to reveal internal features of the tank assembly 12 .
  • a blower and combustion assembly 100 which includes a burner 102 , delivers hot combustion products downwardly from the top of the water heater 10 into a first pass flue 26 , which makes a first pass extending through water in the water heater 10 and provides for primary heat exchange.
  • FIG. 2 provides a cross-sectional view that cuts through the first pass flue 26 . While a wide variety of materials and dimensions can be selected for first pass flue 26 , one exemplary embodiment is a tube or pipe having an 8-inch outer diameter.
  • the first pass flue 26 delivers combustion products from the burner 102 at the top of the water tank, through the water contained in the water tank, and into a first pass collector assembly 28 , the details of which will be provided later with reference to FIG. 7 .
  • FIG. 3 which provides a cross-sectional view of the commercial water heater 10 that cuts through flues forming the second pass
  • combustion products from the first pass collector assembly 28 travel upwardly into two (2) second pass flues 30 A, 30 B.
  • the exemplary embodiment of the commercial water heater 10 illustrated in the figures includes second pass flues 30 A, 30 B formed from pipe or tube having a four-inch outer diameter. Second pass flues 30 A, 30 B are provided with flue baffles 32 A, 32 B, respectively.
  • the flue baffles 32 A, 32 B are provided to improve heat exchange from the combustion products in the second pass flues 30 A, 30 B to water in the water heater 10 . From second pass flues 30 A, 30 B, combustion products are delivered into a second pass collector assembly 34 , the details of which will be provided later with reference to FIG. 10 .
  • FIG. 4 which provides a cross-sectional view cutting through three (3) of eight (8) third pass flues, the flow of combustion products from the second pass collector assembly 34 will be described.
  • Combustion products flow from the second pass collector assembly 34 into eight (8) third pass flues 36 A- 36 H.
  • the exemplary embodiment of the commercial water heater 10 illustrated in the figures includes third pass flues 36 A- 36 H formed from pipe or tube having a two-inch outer diameter.
  • the third pass flues 36 A- 36 H are each provided with flue baffles 38 A- 38 H, respectively, in order to optimize heat exchange.
  • the combustion products are delivered to an exhaust collector assembly 40 at the bottom of the commercial water heater 10 which will be described later in greater detail with reference to FIGS. 8 and 9 .
  • FIG. 5 which provides additional details of the exhaust system of the commercial water heater 10 , further exemplary details of the third pass flues 36 A- 36 H and exhaust collector assembly 40 will be described.
  • condensate will form in the heat exchange tubing (or flues) as the efficiency of heat exchange increases by virtue of the reduced temperature of the exhaust gases. More specifically, as the temperatures of the combustion products diminish in the third pass flues 36 A- 36 H of the commercial water heater 10 , water vapor in the combustion products will tend to condense on the interior surfaces of the flues.
  • the commercial water heater 10 facilitates the transport of such condensate out of the water heater so as to reduce the corrosive impact of such condensate over time.
  • Each of the flues 26 , 30 A, 30 B, and 36 A- 36 H illustrated in FIGS. 2-5 are substantially straight and vertical in orientation.
  • the straight configuration and vertical orientation have been discovered to reduce the corrosive effect of condensation. More specifically, gravity encourages the downward flow of condensate along the vertical surfaces of the heat exchange tubes. The elimination of horizontal surfaces reduces the tendency for condensate to remain on the heat exchange surfaces.
  • the second pass and third pass flues 30 A, 30 B, and 36 A- 36 H are coated on their inside and/or outside surfaces. Such a coating helps to protect the flues against the corrosive effect of the condensate.
  • second pass and third pass flues 30 A, 30 B, and 36 A- 36 H are glass lined.
  • the first pass flue 26 is also optionally lined.
  • an exhaust elbow or conduit 42 is connectable to the exhaust collector assembly 40 of the commercial water heater 10 .
  • Condensate from the third pass flues 36 A- 36 H will travel by gravity downwardly in the vertical third pass flues and into the exhaust collector assembly 40 .
  • the condensate is indicated by the numeral “ 43 ” in FIG. 5 .
  • the commercial water heater 10 is provided with a condensate outlet 44 , which leads to a condensate drain or a condensate pump or other means for permitting the condensate to flow or be withdrawn from the water heater 10 . Exemplary details of the exhaust collector assembly 40 will be described later with reference to FIG. 9 .
  • FIGS. 6A and 6B show bottom perspective and top perspective views of the commercial water heater 10 , respectively.
  • the tank assembly 12 of the water heater 10 includes the first pass collector assembly 28 and the exhaust collector assembly 40 in a bottom portion of the assembly.
  • the water heater 10 is also provided with an orifice 46 in the tank assembly 12 through which an exhaust conduit such as conduit 42 can extend.
  • the tank assembly 12 includes the second pass collector assembly 34 in a top portion of the assembly.
  • the first pass collector assembly 28 generally provides a chamber that communicates with the first pass flue 26 and the second pass flues 30 A, 30 B, thereby facilitating the flow of combustion products from the first pass flue 26 to the second pass flues 30 A, 30 B.
  • the first pass collector assembly 28 includes a primary refractory 48 , which is configured to reduce heat loss from the combustion products as they are transported from the first pass flue 26 to the second pass flues 30 A, 30 B.
  • the primary refractory is optionally formed from a high-density insulation.
  • the primary refractory 48 includes a wall portion 50 and a base portion 52 .
  • the wall and base portions 50 and 52 can be formed from a layer of insulation that can be up to or exceeding one and a half inches in thickness.
  • Wall portion 50 includes an upper wall portion 51 that includes a surface that contacts a bottom 27 of the water tank.
  • the first pass collector assembly 28 also includes a secondary refractory 54 that is positioned adjacent to the base portion 52 of the primary refractory 48 .
  • the secondary refractory 54 adds an additional layer of insulation and can be formed from the same material as primary refractory 48 .
  • the first pass collector assembly also includes a collector cover 56 having a wall portion 58 and a base portion 60 .
  • Wall portion 58 includes an upper wall portion 57 that includes a surface that may be welded or otherwise coupled to water tank bottom 27 . While the collector cover 56 can be formed from a wide variety of materials, one exemplary embodiment of the collector cover 56 is formed from sheet metal.
  • a primary seal is formed by compression of the upper edge of the wall portion 50 of the primary refractory 48 against the bottom surface of the water tank.
  • a secondary seal can be provided by means of a weld between the collector cover 56 and the base of the water tank along the upper edge of the wall portion 58 of the collector cover 56 .
  • FIG. 7 a is a cross sectional side view of a portion of collector cover 56 , refractory 48 , and water tank bottom 27 .
  • FIG. 7 a illustrates a configuration in which the upper wall portion 51 of the wall portion 50 of the refractory 48 is in substantially continuous contact with water tank bottom 27 .
  • collector cover 56 has not compressed refractory 48 , and as such, collector cover 56 is not in contact with or directly proximal to water tank bottom 27 .
  • upper wall portion 51 of wall portion 50 of refractory 48 extends outwardly (upwardly in FIG. 7 a ) beyond the upper wall portion 57 of the wall portion 58 of the cover 56 such that refractory 48 may be compressed against water tank bottom 27 .
  • refractory 48 has been compressed so that a seal is formed between upper wall portion 51 and water tank bottom 27 .
  • upper wall portion 51 includes a contour, such as a beveled edge 51 a, to decrease the surface area of contact between the refractory 48 and the water tank bottom 27 .
  • a contour such as a beveled edge 51 a
  • the surface area of upper wall portion 51 that contacts water tank bottom 27 is decreased, thereby reducing the surface area that must be compressed to form a seal between the water tank and the refractory.
  • the pressure of the refractory 48 against water tank bottom 27 is increased, thereby forming a better seal.
  • beveled edge 51 a distributes the compression load across 2 axes (i.e., the vertical axis along which wall portion 50 extends, and the horizontal axis along which water tank bottom 27 extends).
  • contours can be selected to decrease the surface area of contact between the refractory and the water tank bottom. Any contour can be used to reduce the surface area to less than that of the cross-sectional area of the refractory.
  • FIG. 7 a also illustrates upper wall portion 57 of wall portion 58 of collector cover 56 .
  • collector cover 56 has not yet compressed refractory 48 (or the refractory 48 has not been otherwise compressed). Consequently, upper wall portion 57 is not in contact with or directly proximal to water tank bottom 27 .
  • upper wall portion 57 is separated from water tank bottom 27 by a gap G.
  • gap G depends upon various factors. For example, gap G is selected based upon the density or compressibility of the material chosen to form refractory 48 , the size and dimensions of refractory 48 , and the pressure desired to form a seal between the refractory 48 and the water tank bottom 27 .
  • gap G is at least about 3/16′′ though smaller and bigger gaps are contemplated as well.
  • the size of gap G may therefore be modified depending upon the material selected for refractory 48 , the degree of seal desired, and the dimensions of refractory 48 (e.g., wall thickness, depth, width of beveled edge 51 a, etc.).
  • refractory 48 is compressed by at least about 3/16′′, thereby providing a seal between refractory 48 and water tank bottom 27 .
  • collector cover 56 has compressed refractory 48 (or refractory 48 has been otherwise compressed) such that upper wall portion 57 of wall portion 58 (of collector cover 56 ) is now proximal to or in contact with water tank bottom 27 . It is not necessary that refractory 48 be completely compressed against water tank bottom 27 , but refractory 48 is preferably compressed to the extent that a seal is formed against water tank bottom 27 .
  • a weld 57 a or other coupling is provided between upper wall portion 57 and water tank bottom 27 , thereby providing a secondary seal between first pass collector assembly 28 and water tank bottom 27 (in addition to the primary seal provided by refractory 48 ).
  • Weld 57 a may be a 360 degree weld, as opposed to a tack weld, such that the entire perimeter of upper wall portion 57 is welded to water tank bottom 27 .
  • one or more fasteners or mechanisms can be used to couple the upper wall portion 57 of the collector cover 56 adjacent to the water tank bottom 27 .
  • the exhaust collector assembly 40 is engaged to a bottom surface of the water tank by means of a series of fasteners extending through a flange 62 .
  • caulking or other filler or adhesives can be used to create a seal between the top of the exhaust collector assembly 40 and the bottom of the water heater tank.
  • the exhaust collector assembly 40 provides a chamber for receiving the combustion products and condensate from each of the third pass flues 36 A- 36 H. In that manner, the combustion products can be directed toward the exhaust conduit 42 (shown in FIG. 5 ). Also, the condensate can be collected from the flue tubes for delivery to the condensate outlet 44 (also shown in FIG. 5 ).
  • Exhaust collector assembly 40 includes an exhaust collector basin 64 that forms a receptacle. Although a wide variety of configurations and materials can be selected, exhaust collector basin 64 is optionally molded from ABS or another suitable plastic material. The wall of the basin 64 is sized and shaped to encompass the outlets of the third pass flues 36 A- 36 H.
  • Exhaust collector assembly 40 also includes an orifice plate 66 that defines an exhaust orifice 68 , through which exhaust is permitted to flow from the exhaust collector basin 64 toward the exhaust conduit 42 .
  • the orifice plate 66 also defines a condensate notch 70 through which condensate is permitted to flow from exhaust collector basin 64 toward the condensate outlet 44 .
  • the orifice plate 66 can be provided with a series of studs 72 A- 72 D for mounting the orifice plate 66 to the exhaust collector basin 64 .
  • orifice plate 66 may be advantageously formed from stainless steel.
  • the size of the exhaust orifice 68 can be changed to modify the BTUs generated by the commercial water heater 10 . While a variety of sizes can be selected, the exhaust orifice 68 in one exemplary embodiment ranges from about one inch to about one and one-quarter inch in diameter, although smaller and larger orifices are contemplated as well. In the illustrated embodiment, an orifice diameter of about one and one-eighth inch has been selected. In order to increase the BTU input of the water heater 10 , the orifice size of the exhaust orifice 68 can be increased. Conversely, making the exhaust orifice 68 smaller can decrease the BTU input.
  • the exhaust collector assembly 40 is also provided with an exhaust adapter 74 in order to facilitate a connection between the exhaust collector basin 64 and the exhaust conduit 42 .
  • the exhaust adapter 74 can be molded from ABS, although other materials and forming methods are contemplated as well.
  • the exhaust adapter 74 includes a mounting component 76 which receives the studs 72 A- 72 D of the orifice plate 66 and provides a flange to facilitate the mounting of the exhaust adapter 74 and the orifice plate 66 to the exhaust collector basin 64 .
  • the exhaust adapter 74 also includes a mating component 78 that is connected to the mounting component 76 .
  • the mating component 78 provides surfaces to which the exhaust conduit 42 can be connected.
  • FIG. 10 provides an exploded view of the upper components of the commercial water heater 10 , revealing the unheated water inlet 22 , the heated water outlet 24 , the first pass flue 26 , a second pass flue 30 and its corresponding baffle 32 , and a third pass flue 36 and its corresponding baffle 38 .
  • the baffles 32 and 38 are shown as extending from their respective flues 30 and 36 for purposes of illustration.
  • the second pass collector assembly 34 is mounted to the top of the water tank by means of collector brackets extending upwardly from the upper surface of the tank's head.
  • a fastener such as a bolt is used to engage flanges provided on the second pass collector assembly 34 to the collector brackets.
  • a layer of caulking or other sealant can be used to form a seal between the base portion of the second pass collector assembly 34 and the upper surface of the tank head.
  • the second pass collector assembly 34 provides a chamber for receiving combustion products from the second pass flues 30 A, 30 B, and for delivering those combustion products to the third pass flues 36 A- 36 H. Accordingly, the second pass assembly is shaped to cover each of the openings of the second pass flues 30 A, 30 B and third pass flues 36 A- 36 H.
  • the second pass collector assembly 34 can be formed from a wide variety of materials and is optionally formed from stainless steel such as 316 SST.
  • a second pass collector insulator 80 is provided to fit over the top of the second pass collector assembly 34 .
  • the embodiment of the second pass insulator 80 illustrated in FIG. 10 is formed from a sheet of insulation that is scored to permit the perimeter portions to be folded down so as to conform to and surround the walls of the second pass collector assembly 34 .
  • Both the second pass collector assembly 34 and the second pass insulator 80 are provided with contours to accommodate portions of the blower and combustion assembly 100 .
  • Insulator 82 is provided over the second pass collector insulation 80 .
  • Insulator 82 can be formed from a wide variety of insulating materials, but is optionally formed from a lamination of two or more insulating materials.
  • Insulator 82 is provided with three (3) orifices; namely, an orifice 84 to accommodate the unheated water inlet 22 , an orifice 86 to accommodate the heated water outlet 24 , and an orifice 88 to accommodate a portion of the blower and combustion assembly 100 .
  • a combustion ring 90 surrounds the insulator 82 and provides a transition for connection between the water tank of the water heater 10 and the outer jacket (not shown) of the water heater 10 . More specifically, the combustion ring 90 includes a smaller diameter portion 92 at a lower end for mating with a surface of the water tank and a larger diameter portion 94 at an upper end for mating with a surface of the outer jacket.
  • the space between the outer wall surface of the water tank and the inner wall surface of the jacket will be at least partially filled with insulation, and the combustion ring 90 helps to maintain a consistent annular space between the tank and the jacket. While it can be formed from a wide variety of materials, one exemplary material for combustion ring is sheet metal.
  • a combustion surround base 96 is illustrated for use at the top portion at the water tank.
  • the combustion surround base 96 is positioned so as to connect to the top portion of the combustion ring 90 .
  • the combustion surround base 96 is formed from a pair of flanged sheets 96 A and 96 B, which are fastened to one another in a back-to-back arrangement.
  • the flanged sheets 96 A and 96 B of the combustion surround base 96 are provided with an access opening 98 to permit access to the blower and combustion system 100 as well as the inlet 22 and outlet 24 for maintenance.
  • the blower and combustion assembly 100 includes a blower 104 and a blower gasket 106 .
  • a blower 104 is a DC blower such as Model No. RG148 provided by EBM Industries, Inc. of Farmington, Conn., which is a 1/7 HP blower operating at 6400 RPM.
  • the assembly 100 also includes a burner transition tube 108 having an upper flange 110 and a lower flange 112 .
  • the burner transition tube 108 provides a transition between the flange of the blower 104 and the flange of the burner 102 .
  • a burner gasket 114 is provided below the lower flange of the burner transition tube 108 .
  • the burner 102 has an upper flange 116 and a burner body 118 as well as a lower burner gasket 120 .
  • one exemplary burner is a radial burner such as those provided by Burner Systems International, Inc. of Chattanooga, Tenn.
  • a burner mounting flange assembly 122 is provided as a component of the blower and combustion assembly 100 in order to facilitate mounting of the blower/burner assembly to the water tank. Further details of the burner mounting flange assembly 122 will be provided later in connection with a description of FIG. 15 .
  • a mounting flange gasket 124 formed from a fibrous gasket material or neoprene, for example, is provided to create a seal between the burner mounting flange assembly 122 and the water tank.
  • An igniter 126 is mounted to the lower flange 112 of the burner transition tube 108 to provide for ignition of the burner 102 .
  • various igniters may be selected for use in the blower and combustion assembly, an exemplary hot surface ceramic igniter is provided by Saint-Gobain Igniter Products of Milford, N.H.
  • An ignition controller such as the Series 1013 ignition controller of United Technologies, is optionally used.
  • a flame sensor 128 is also mounted to the lower flange 112 of the burner transition tube 108 in order to sense the presence or absence of a flame emanating from the burner 102 .
  • the flame sensor 128 may operate by flame rectification, such as sensors available from Precision Speed Equipment, or other sensor types can be selected.
  • the igniter 126 and the sensor 128 are optionally oriented at opposite sides of the burner 102 (i.e., separated by 180 degrees). Other configurations are contemplated as well.
  • the blower and combustion assembly also includes an air intake and gas mixer 130 having a gas valve mounting flange 132 .
  • the air intake and gas mixer 130 can be a venturi such as those offered by Honeywell International, Inc.
  • a gas valve 134 is connected to the flange 132 of the air intake and gas mixer 130 , and the air intake and gas mixer 130 is in turn mounted to the body of the blower 104 .
  • various gas valves may be selected for use in the blower and combustion assembly, one exemplary gas valve is offered under Model No. VK8115, by Honeywell International, Inc.
  • the premix of fuel and air (provided by the gas valve 134 and the air intake and gas mixer 130 ) is provided upstream of the blower 104 .
  • the blower and combustion assembly 100 provides a negative premix gas-fired combustion system.
  • the outlet of the blower 104 and the body 118 of the burner 102 are both oriented along the same vertical axis. It has been discovered that this orientation of the blower 104 and the burner 102 tends to increase the heat exchange between the combustion products and the water in the water tank.
  • This configuration (i.e., vertical) has also been discovered to reduce the impact of any naturally occurring condensation on the burner. More specifically, unheated water entering the water heater 10 is sometimes at low temperatures (especially in Northern geographies) and brings about natural condensation of water on the internal components of the water heater. If such condensate forms or drips onto the body of the burner, the life of the burner may be compromised. It has been discovered that the vertical orientation of the burner 102 can help to reduce this problem.
  • FIG. 13 a cross-sectional side view of a subassembly of the burner mounting flange assembly 122 , the burner transition tube 108 , and the burner 102 is illustrated.
  • FIG. 13 shows the mating relationship between the burner transition tube 108 , burner gaskets 114 and 120 , upper flange 116 of the burner 102 and the burner mounting flange assembly 122 .
  • FIG. 13 illustrates an exemplary orientation of igniter 126 and sensor 128 at opposite sides of the body 118 of the burner 102 .
  • a side view of the burner 102 is illustrated by itself in FIG. 14 for clarity.
  • Burner mounting flange assembly 122 includes a flange body 136 having an outer lip 138 and an inner lip 140 .
  • Outer lip 138 includes mounting holes (not shown in this view) to facilitate mounting to an upper portion of the water tank.
  • a burner mounting plate 142 is welded to an interior surface of the flange body 136 of the assembly 122 .
  • the burner mounting plate 142 includes four (4) mounting studs 144 A- 144 D (only two are shown) for mounting the burner 102 to the burner mounting flange assembly 122 .
  • An insulation component 146 is captured between the inner lip 140 of the flange body 136 and the burner mounting plate 142 of the assembly 122 .
  • the insulation 146 can optionally be formed from the same material as the primary refractory 48 of the first pass collector assembly 28 .
  • Air intake and gas mixer 130 may therefore act as a venturi.
  • the combustion air inlet 16 and gas inlet 18 are connected to the air intake 130 and gas valve 134 , respectively.
  • the air inlet 16 may be a 3 inch PVC pipe
  • the gas inlet 18 may be a 3 ⁇ 4 inch pipe.
  • the head assembly 200 encapsulates the upper-most components of the water heater 10 , including the blower and combustion assembly 100 and the second pass collector assembly 34 .
  • the head assembly 200 includes a combustion surround 202 , a head 204 that caps the combustion surround 202 , and at least one latch 206 (optionally two or more latches 206 ) for engaging the head 204 to the combustion surround 202 .
  • FIG. 19 An exemplary embodiment of a combustion surround 202 is illustrated in FIG. 19 .
  • the combustion surround 202 includes a series of vents in the form of “shark gills” 208 . While vents in the head assembly 200 can take a wide variety of forms, shapes, and configurations, ornamental “shark gill” vents 208 have been selected to enhance the ornamental appearance of the head assembly 200 . The particular shape and configuration of the “shark gill” vents 208 are non-functional. The shape and configuration are instead dictated by ornamental concerns.
  • the combustion surround 202 of the head assembly 200 also includes an opening 210 positioned to accommodate the heated water outlet 24 and an opening 212 positioned to accommodate the unheated water inlet 22 .
  • the combustion surround 202 includes an opening 214 positioned to accommodate the air inlet 16 and gas inlet 18 .
  • a water heater corresponding to the exemplary embodiment illustrated in the figures was built and tested to determine its thermal efficiency.
  • the water heater was tested in accordance with the American National Standard/CSA Standard for Gas Water Heaters (Volume III, Storage Water Heaters, With Input Ratings Above 75,000 Btu Per Hour, Circulating and Instantaneous). More specifically, three tests were conducted according to the method set forth in ANSI Standard No. Z21.10.3-2001 ⁇ 2.9 (“Thermal Efficiency”). Thermal efficiency was computed according to the formula set forth in ⁇ 2.9(j).
  • Example 1 Example 2 Example 3 Thermal Efficiency (%) 99.36% 98.66% 98.47% Total Energy Used (Btu's) 100,689.0 100,313.5 101,132.0 Quantity of Water Withdrawn (lbs) 1433.1 1407.1 1408.4 Thermal ⁇ T (° F.): 69.8 70.3 70.7 Average Delivered Temperature 139.8 140.7 140.6 (° F.) Average Inlet Temperature (° F.) 70.0 70.3 69.9 Starting Outlet Temperature (° F.) 139.8 140.0 140.5 Ending Outlet Temperature (° F.) 139.6 140.4 140.7 Diameter of Orifice* (inch) 1 3/16 11 ⁇ 8 1 3/16 *Refers to orifice 68 of orifice plate 66 shown in FIG. 9

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Details Of Fluid Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US10/374,605 2002-06-04 2003-02-26 High efficiency water heater Expired - Lifetime US7559293B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US10/374,605 US7559293B2 (en) 2002-06-04 2003-02-26 High efficiency water heater
TW092115030A TWI276761B (en) 2002-06-04 2003-06-03 High efficiency water heater
CA2430807A CA2430807C (fr) 2002-06-04 2003-06-03 Chauffe-eau a rendement eleve
CA2844271A CA2844271C (fr) 2002-06-04 2003-06-03 Chauffe-eau a rendement eleve
EP03253535A EP1369647B1 (fr) 2002-06-04 2003-06-04 Chaudière à haut rendement
US12/121,154 US7900589B2 (en) 2002-06-04 2008-05-15 High efficiency water heater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38559502P 2002-06-04 2002-06-04
US10/374,605 US7559293B2 (en) 2002-06-04 2003-02-26 High efficiency water heater

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/121,154 Division US7900589B2 (en) 2002-06-04 2008-05-15 High efficiency water heater

Publications (2)

Publication Number Publication Date
US20040011301A1 US20040011301A1 (en) 2004-01-22
US7559293B2 true US7559293B2 (en) 2009-07-14

Family

ID=29553452

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/374,605 Expired - Lifetime US7559293B2 (en) 2002-06-04 2003-02-26 High efficiency water heater
US12/121,154 Expired - Fee Related US7900589B2 (en) 2002-06-04 2008-05-15 High efficiency water heater

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/121,154 Expired - Fee Related US7900589B2 (en) 2002-06-04 2008-05-15 High efficiency water heater

Country Status (4)

Country Link
US (2) US7559293B2 (fr)
EP (1) EP1369647B1 (fr)
CA (2) CA2844271C (fr)
TW (1) TWI276761B (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100064987A1 (en) * 2006-08-16 2010-03-18 Herbert Edward Smith Gas water heater
US20110214621A1 (en) * 2010-03-08 2011-09-08 Rheem Manufacturing Company High efficiency gas-fired water heater
US20120080172A1 (en) * 2010-10-01 2012-04-05 Aic S.A. Heat Exchanger
US20120138278A1 (en) * 2010-12-01 2012-06-07 Aic S.A. Heat Exchanger
US20130074786A1 (en) * 2011-09-26 2013-03-28 Claude Lesage Gas water heater with increased thermal efficiency and safety
US8807093B2 (en) 2011-05-19 2014-08-19 Bock Water Heaters, Inc. Water heater with multiple heat exchanging stacks
US20140261239A1 (en) * 2013-03-13 2014-09-18 Regal Beloit America, Inc. Water Heater Having Upstream and Downstream Manifolds
US20150144075A1 (en) * 2013-11-27 2015-05-28 Bradford White Corporation Water heater having a down fired combustion assembly
US9714774B2 (en) 2012-08-22 2017-07-25 Rheem Manufacturing Company Downfired high efficiency gas-fired water heater
US20180010787A1 (en) * 2015-01-21 2018-01-11 Junggon Kim Hot Water Boiler
US10184690B2 (en) 2017-02-09 2019-01-22 Bock Water Heaters, Inc. Condensing water heater and condensation control system
USD844768S1 (en) 2017-09-06 2019-04-02 Rheem Manufacturing Company Water heater top cap assembly
US20190203974A1 (en) * 2017-12-28 2019-07-04 Rheem Manufacturing Company Water Heater With Top Water Outlet
US10508830B2 (en) 2017-06-08 2019-12-17 Rheem Manufacturing Company High efficiency gas-fired water heater
US10605485B2 (en) * 2015-10-26 2020-03-31 Rinnai Corporation Water heater
US10969139B1 (en) * 2019-04-23 2021-04-06 Willard Richard Water heater
US11125439B2 (en) 2018-03-27 2021-09-21 Scp Holdings, An Assumed Business Name Of Nitride Igniters, Llc Hot surface igniters for cooktops
US11346578B2 (en) 2017-12-28 2022-05-31 Rheem Manufacturing Company Conduit fitting with integrated condensate trap

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080006227A1 (en) * 2006-07-09 2008-01-10 Evergreen Innovation Partners I, Lp Water heater with passive automatic hot water circulation through a home or building
US7992526B2 (en) * 2008-06-06 2011-08-09 Bradford White Corporation Condensing water heater
EP2435765B1 (fr) * 2009-05-29 2016-08-24 Thor Froelich Braathen Chauffe-eau, combinaison d'un couvercle supérieur et d'un plateau inférieur p pour un chauffe-eau, et couvercle inférieur pour chauffe-eau, destinés à empêcher un endommagement de l'eau
US9074792B2 (en) * 2010-02-25 2015-07-07 Harsco Corporation Multiple-ring heat exchanger
TWI410596B (zh) * 2010-06-29 2013-10-01 Grand Mate Co Ltd Water heater and its safety inspection method
EP2413031B1 (fr) * 2010-07-26 2014-05-07 Hovalwerk AG Dispositif de combustion à prémélange
ITBO20110281A1 (it) * 2011-05-18 2012-11-19 Riello Spa Bruciatore premiscelato
KR101388344B1 (ko) * 2012-05-15 2014-04-22 대성산업 주식회사 콘덴싱 열교환기 및 이를 포함한 보일러
USD767107S1 (en) * 2013-03-15 2016-09-20 Htp, Inc. Heat exchanger
US9464805B2 (en) * 2013-01-16 2016-10-11 Lochinvar, Llc Modulating burner
US9618232B2 (en) 2013-04-16 2017-04-11 Theodore S. BROWN Conversion of single-pass boiler to multi-pass operation
US10373259B1 (en) 2014-05-20 2019-08-06 State Farm Mutual Automobile Insurance Company Fully autonomous vehicle insurance pricing
US20210133871A1 (en) 2014-05-20 2021-05-06 State Farm Mutual Automobile Insurance Company Autonomous vehicle operation feature usage recommendations
US11669090B2 (en) 2014-05-20 2023-06-06 State Farm Mutual Automobile Insurance Company Autonomous vehicle operation feature monitoring and evaluation of effectiveness
US9972054B1 (en) 2014-05-20 2018-05-15 State Farm Mutual Automobile Insurance Company Accident fault determination for autonomous vehicles
TWI557383B (zh) * 2014-09-02 2016-11-11 Grand Mate Co Ltd Water heater and its secondary heat exchanger
GB2586186B (en) 2015-10-12 2021-05-19 Bradford White Corp High-efficiency condensing water heater
US10458677B2 (en) * 2015-12-11 2019-10-29 Lochinvar, Llc Heat exchanger with dual concentric tube rings
US20180156471A1 (en) * 2016-12-02 2018-06-07 Haier Us Appliance Solutions, Inc. Water heater appliance
JP6985919B2 (ja) * 2017-12-19 2021-12-22 リンナイ株式会社 燃焼装置
US10352585B1 (en) * 2018-02-09 2019-07-16 Theodore S. BROWN Multi-pass boiler and retrofit method for an existing single-pass boiler
CN109579283A (zh) * 2018-09-27 2019-04-05 中山市思源电器有限公司 一种具有向下燃烧的燃烧组件的热水器

Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444855A (en) * 1966-01-31 1969-05-20 Ernest Horace Priest Heat exchanger and heat exchange element therefor
US4329943A (en) * 1979-08-27 1982-05-18 Eugen Josef Siegrist Heating boiler
US4492185A (en) 1981-10-05 1985-01-08 Alzeta Corporation High efficiency, reduced emissions water heater
US4541410A (en) 1983-07-20 1985-09-17 Columbia Gas System Service Corporation Apparatus and method for burning a combustible gas, and a heat exchanger for use in this apparatus
US4846150A (en) * 1986-08-21 1989-07-11 Beaumont (U.K.) Limited Vertical tube water heater
US4875465A (en) 1988-05-16 1989-10-24 A. O. Smith Corporation High efficiency submersible chamber water heater
DE3914746A1 (de) 1988-05-10 1989-11-16 Vaillant Joh Gmbh & Co Waermetauscher, insbesondere fuer brennerbetriebene wasserheizer
US4889105A (en) * 1984-03-30 1989-12-26 State Industries, Inc. Water heater construction and method of manufacture
US5027749A (en) * 1990-10-16 1991-07-02 Stacey Heating & Plumbing Supplies, Ltd. High efficiency water heater
US5197415A (en) * 1992-04-02 1993-03-30 Rheem Manufacturing Company Wet-base, down-fired water heater
US5279261A (en) * 1992-10-16 1994-01-18 Moscone Robert T Downfired boiler having vertical heat transfer tubes
US5314009A (en) * 1992-10-08 1994-05-24 Gas Research Institute Exhaust gas recuperator
EP0616173A2 (fr) 1993-03-19 1994-09-21 Fröling GmbH & Co. Kessel-Apparatebau Procédure et chaudière pour le chauffage combiné d'un chauffage d'un batiment et d'un accumulateur pour eau sanitaire
US5687678A (en) 1995-01-26 1997-11-18 Weben-Jarco, Inc. High efficiency commercial water heater
US5699756A (en) * 1996-10-08 1997-12-23 Rheem Manufacturing Co. Wet-base, down-fired water heater
EP0915304A2 (fr) 1997-11-06 1999-05-12 VIESSMANN WERKE GmbH & CO. Chaudière à trois passages
EP1004833A2 (fr) 1998-11-27 2000-05-31 Max Weishaupt GmbH Chaudière
EP1008819A2 (fr) 1998-12-11 2000-06-14 Vulcano-Sadeca, S.A. Générateur d'eau chaude pour fonctionnement à faible température
US6286465B1 (en) * 2000-04-28 2001-09-11 Aos Holding Company Water heater flue system
US20010027756A1 (en) * 1999-05-12 2001-10-11 Vago Otto Z. Water heater
US6619951B2 (en) * 2000-01-10 2003-09-16 Lochinvar Corporation Burner
US6634320B2 (en) * 2001-02-08 2003-10-21 Op Controls S.P.A. Flame atmosphere analyzer and a water-heating device including the analyzer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899696A (en) * 1985-09-12 1990-02-13 Gas Research Institute Commercial storage water heater process
US7290503B2 (en) * 2006-02-09 2007-11-06 Rheem Manufacturing Company High efficiency, wet-base, downfired multi-pass water heater

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444855A (en) * 1966-01-31 1969-05-20 Ernest Horace Priest Heat exchanger and heat exchange element therefor
US4329943A (en) * 1979-08-27 1982-05-18 Eugen Josef Siegrist Heating boiler
US4492185A (en) 1981-10-05 1985-01-08 Alzeta Corporation High efficiency, reduced emissions water heater
US4541410A (en) 1983-07-20 1985-09-17 Columbia Gas System Service Corporation Apparatus and method for burning a combustible gas, and a heat exchanger for use in this apparatus
US4889105A (en) * 1984-03-30 1989-12-26 State Industries, Inc. Water heater construction and method of manufacture
US4846150A (en) * 1986-08-21 1989-07-11 Beaumont (U.K.) Limited Vertical tube water heater
DE3914746A1 (de) 1988-05-10 1989-11-16 Vaillant Joh Gmbh & Co Waermetauscher, insbesondere fuer brennerbetriebene wasserheizer
US4875465A (en) 1988-05-16 1989-10-24 A. O. Smith Corporation High efficiency submersible chamber water heater
US5027749A (en) * 1990-10-16 1991-07-02 Stacey Heating & Plumbing Supplies, Ltd. High efficiency water heater
US5197415A (en) * 1992-04-02 1993-03-30 Rheem Manufacturing Company Wet-base, down-fired water heater
US5314009A (en) * 1992-10-08 1994-05-24 Gas Research Institute Exhaust gas recuperator
US5279261A (en) * 1992-10-16 1994-01-18 Moscone Robert T Downfired boiler having vertical heat transfer tubes
EP0616173A2 (fr) 1993-03-19 1994-09-21 Fröling GmbH & Co. Kessel-Apparatebau Procédure et chaudière pour le chauffage combiné d'un chauffage d'un batiment et d'un accumulateur pour eau sanitaire
US5687678A (en) 1995-01-26 1997-11-18 Weben-Jarco, Inc. High efficiency commercial water heater
US5699756A (en) * 1996-10-08 1997-12-23 Rheem Manufacturing Co. Wet-base, down-fired water heater
EP0915304A2 (fr) 1997-11-06 1999-05-12 VIESSMANN WERKE GmbH & CO. Chaudière à trois passages
EP1004833A2 (fr) 1998-11-27 2000-05-31 Max Weishaupt GmbH Chaudière
EP1008819A2 (fr) 1998-12-11 2000-06-14 Vulcano-Sadeca, S.A. Générateur d'eau chaude pour fonctionnement à faible température
US20010027756A1 (en) * 1999-05-12 2001-10-11 Vago Otto Z. Water heater
US6619951B2 (en) * 2000-01-10 2003-09-16 Lochinvar Corporation Burner
US6286465B1 (en) * 2000-04-28 2001-09-11 Aos Holding Company Water heater flue system
US6634320B2 (en) * 2001-02-08 2003-10-21 Op Controls S.P.A. Flame atmosphere analyzer and a water-heating device including the analyzer

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8375897B2 (en) * 2006-08-16 2013-02-19 Aos Holding Company Gas water heater
US20100064987A1 (en) * 2006-08-16 2010-03-18 Herbert Edward Smith Gas water heater
US9004018B2 (en) 2010-03-08 2015-04-14 Rheem Manufacturing Company High efficiency gas-fired water heater
US20110214621A1 (en) * 2010-03-08 2011-09-08 Rheem Manufacturing Company High efficiency gas-fired water heater
US20120080172A1 (en) * 2010-10-01 2012-04-05 Aic S.A. Heat Exchanger
US8720387B2 (en) * 2010-10-01 2014-05-13 Aic S.A. Heat exchanger
US20120138278A1 (en) * 2010-12-01 2012-06-07 Aic S.A. Heat Exchanger
US8813688B2 (en) * 2010-12-01 2014-08-26 Aic S.A. Heat exchanger
US8807093B2 (en) 2011-05-19 2014-08-19 Bock Water Heaters, Inc. Water heater with multiple heat exchanging stacks
US20130074786A1 (en) * 2011-09-26 2013-03-28 Claude Lesage Gas water heater with increased thermal efficiency and safety
US10415849B2 (en) 2012-08-22 2019-09-17 Rheem Manufacturing Company Down-fired high efficiency gas-fired water heater
US9714774B2 (en) 2012-08-22 2017-07-25 Rheem Manufacturing Company Downfired high efficiency gas-fired water heater
US8960131B2 (en) * 2013-03-13 2015-02-24 Regal Beloit America, Inc. Water heater having upstream and downstream manifolds
US20140261239A1 (en) * 2013-03-13 2014-09-18 Regal Beloit America, Inc. Water Heater Having Upstream and Downstream Manifolds
US20150144075A1 (en) * 2013-11-27 2015-05-28 Bradford White Corporation Water heater having a down fired combustion assembly
WO2015081186A1 (fr) 2013-11-27 2015-06-04 Bradford White Corporation Chauffe-eau ayant un ensemble de combustion à allumage par le bas
US9429337B2 (en) * 2013-11-27 2016-08-30 Bradford White Corporation Water heater having a down fired combustion assembly
US10281139B2 (en) * 2015-01-21 2019-05-07 Junggon Kim Hot water boiler
US20180010787A1 (en) * 2015-01-21 2018-01-11 Junggon Kim Hot Water Boiler
US10605485B2 (en) * 2015-10-26 2020-03-31 Rinnai Corporation Water heater
US10184690B2 (en) 2017-02-09 2019-01-22 Bock Water Heaters, Inc. Condensing water heater and condensation control system
US10508830B2 (en) 2017-06-08 2019-12-17 Rheem Manufacturing Company High efficiency gas-fired water heater
USD844768S1 (en) 2017-09-06 2019-04-02 Rheem Manufacturing Company Water heater top cap assembly
US20190203974A1 (en) * 2017-12-28 2019-07-04 Rheem Manufacturing Company Water Heater With Top Water Outlet
US10801748B2 (en) * 2017-12-28 2020-10-13 Rheem Manufacturing Company Water heater with top water outlet
US11346578B2 (en) 2017-12-28 2022-05-31 Rheem Manufacturing Company Conduit fitting with integrated condensate trap
US11125439B2 (en) 2018-03-27 2021-09-21 Scp Holdings, An Assumed Business Name Of Nitride Igniters, Llc Hot surface igniters for cooktops
US11493208B2 (en) 2018-03-27 2022-11-08 Scp Holdings, An Assumed Business Name Of Nitride Igniters, Llc Hot surface igniters for cooktops
US11788728B2 (en) 2018-03-27 2023-10-17 Scp R&D, Llc Hot surface igniters for cooktops
US10969139B1 (en) * 2019-04-23 2021-04-06 Willard Richard Water heater

Also Published As

Publication number Publication date
CA2844271C (fr) 2015-10-13
US20080216772A1 (en) 2008-09-11
EP1369647A3 (fr) 2005-01-19
CA2430807A1 (fr) 2003-12-04
TW200400337A (en) 2004-01-01
CA2844271A1 (fr) 2003-12-04
US20040011301A1 (en) 2004-01-22
CA2430807C (fr) 2014-05-27
EP1369647B1 (fr) 2012-09-19
EP1369647A2 (fr) 2003-12-10
TWI276761B (en) 2007-03-21
US7900589B2 (en) 2011-03-08

Similar Documents

Publication Publication Date Title
US7559293B2 (en) High efficiency water heater
US8807093B2 (en) Water heater with multiple heat exchanging stacks
CA2629127C (fr) Bruleur a combustion interne et ses utilisations
US4275705A (en) Two-stage heat exchanger
US6026804A (en) Heater for fluids
AU2007200275B2 (en) High efficiency, wet-base, dowfired multi-pass water heater
US5775268A (en) High efficiency vertical tube water heater apparatus
US4164210A (en) Pulse combustion system for heating of air
US11287158B2 (en) Heat exchanger and hot water apparatus
US8375897B2 (en) Gas water heater
NZ264019A (en) Condensing furnace; details regarding combustor tubes of primary and secondary heat exchangers located within the furnace housing
US6810836B1 (en) Finned tube water heater
US5385137A (en) U-tube heat exchanger for bakery ovens
CA2003793C (fr) Systeme de derivation des gaz de combustion, pour appareil de chauffage
CN109506259B (zh) 开水型余热回收炉灶
US5345924A (en) Cold spot baffle for coupling box
US20120085522A1 (en) Heat Exchanger System
US10302311B2 (en) Intake drain system and method
CN204574501U (zh) 一种消音的水道内有导流板的扁平型冷凝式热交换器
CN214914834U (zh) 一种壁挂炉的废气处理装置
AU681000B2 (en) High efficiency fuel-fired condensing furnace having a compact heat exchanger system
CN2269556Y (zh) 常压燃油锅炉
JPH06100328B2 (ja) 温風暖房機における煙室部の結露水発生による腐食防止方法および装置
CN113251401A (zh) 一种带有特殊翅片结构的冷凝蒸汽锅炉

Legal Events

Date Code Title Description
AS Assignment

Owner name: BRADFORD WHITE CORPORATION, PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GORDON, MICHAEL;SCOTT, TIMOTHY D.;SUTHERLAND, JASON;AND OTHERS;REEL/FRAME:014249/0071

Effective date: 20030429

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: 11.5 YR SURCHARGE- LATE PMT W/IN 6 MO, LARGE ENTITY (ORIGINAL EVENT CODE: M1556); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12